154 THE HUMAN BODY. 



QUESTIONS. 



SECTION I. 1, What may be the effects of injury to the head? 



2. What may be the effect of an injury to the back ? 



3, Of what parts does the brain consist? 



5, What are the convolutions of the brain? How do these indi- 

 cate the difference between man and the lower animals? 



6, 7, Describe the spinal cord. 



8, What are the membranes of the brain and cord ? How many 

 nerves come from the brain ? How many from the spinal cord ? 



9, What is the appearance of the brain substance? What is the 

 appearance of the substance of the spinal cord ? 



10, Why does a blow on the funny-bone cause a tingling in the 

 little finger ? 



11, What is the course of the nerves outward? What is the 

 course of the nerves inward? What are the nerve centers? 



12, What does the microscope show of the structure of the gray 

 matter? Of the white matter? 



SECTION IT. 1. What is the effect of cutting off the nerve-sup- 

 ply of a portion of the skin ? Of a muscle? 



2, What do we infer from this effect? 



3, Compare the nervous system to a railroad telegraph. What 

 takes place when a mosquito stings ? 



4, Does it take time for a sensation to go through the nerves, or 

 for a motor impulse to return? Do they go as fast as electricity? 



5,6. What are reilex actions? Name and describe some such 

 actions. 



7, May acts at first done by the cerebrum become reflex acts ? 



8, What are the sensory fibers? What are the motor nerve 

 fibers ? 



10, How does the nervous system connect the different parts of 

 the body ? 



SECTION III. 1, How do we know that the cerebrum is the seat 

 of the higher faculties ? 



SECTION IV. 1. What is it to be nervous? What makes people 

 nervous? What breaks down the nervous system ? 



